5-1
• After a lapse of more than 10 minutes after turning off the input power supply, perform
the maintenance and inspection.
Otherwise, there is a danger of electric shock.
• Make sure that only qualified persons will perform maintenance, inspection and part
replacement. (Before starting the work, remove metallic objects from your person
(wristwatch, bracelet, etc.)
(Be sure to use tools protected with insulation.)
Otherwise, there is a danger of electric shock and/or injury.
5.1 Precautions for Maintenance/Inspection
5.1.1 Daily inspection
Every day before operation check the following;
[1] Does the motor operate according to the settings?
[2] Is there any trouble with the surroundings of the installation?
[3] Is there any trouble with the cooling or ventilation system?
[4] Is there any abnormal vibration or sound?
[5] Are their any signs of over-current or discoloration?
[6] Is their any unusual odour present?
Check the input voltage to the inverter by using a meter during running
[1] Is the supply voltage constant?
[2] Are all the phases of the supply balanced?
5.1.2 Cleaning
Make sure that the inverter is not dirty when operating.
Wipe clean with a soft cloth and synthetic detergent or ethanol.
(Note) Don’t use solvents containing any of the following, acetone, benzene, toluene,
alcohol etc. as they can cause melting of the inverter surface, peeling of paint.
Never clean the display part of the digital operator with detergent or alcohol.
5.1.3 Regular inspection
Inspections should be regularly carried out on the parts that can’t be inspected while the
inverter is running.
[1] Is there any trouble with the cooling system? - - - Cleaning of air filter etc.
[2] Check that all screw terminals and fixings are tight as they may loosen due to
vibration or temperature change etc.
[3] Is there any corrosion, damage to insulators?
[4] Measurement of insulation resistance.
[5] Check of cooling fan, smoothing capacitor, relay and exchange if necessary.
Chapter 5 Maintenance, Inspection
WARNING
